Endgame items

Rylai's Crystal Scepter

+400 Health
+100 Ability Power
UNIQUE Passive: Damaging spells and abilities apply a Movement Speed reduction to enemies based on the spell type:
Single Target: 40% reduction for 1.5 seconds.
Area of Effect: 40% reduction for 1 seconds.
Damage over Time or Multi-hit: 20% reduction for 1 seconds.
Summoned Minions: 20% reduction for 1 seconds.
(If a spell fits in more than one category, it uses the weakest slow value.)

Will of the Ancients

+80 Ability Power
+10% Cooldown Reduction
UNIQUE Passive: Your spells and abilities heal you for 15% of the damage dealt, calculated before your target's resistances. This effect is reduced to one third for AoE effects.

If you need more damage "

If you need more damage (depending on the map)

Rabadon's Deathcap

+120 Ability Power
Unique: +35% ability power

Wooglet's Witchcap

+100 Ability Power
+45 Armor
UNIQUE Passive: Increases Ability Power by 25%
UNIQUE Active: Champion becomes invulnerable and untargetable for 2.5 seconds, but is unable to move, attack, cast spells, or use items during this time (90 second cooldown).

If you need more resistance

+100 Ability Power
+45 Armor
UNIQUE Active - Stasis: Champion becomes invulnerable and untargetable for 2.5 seconds, but is unable to move, attack, cast spells, or use items during this time (90 second cooldown).

Wooglet's Witchcap

+100 Ability Power
+45 Armor
UNIQUE Passive: Increases Ability Power by 25%
UNIQUE Active: Champion becomes invulnerable and untargetable for 2.5 seconds, but is unable to move, attack, cast spells, or use items during this time (90 second cooldown).

About objects

You can not fix an equipement to any champion, because dependin on how the game goes over you must get adapted to it, what is true is that i allwais prefer damage before resistance. If you are having a good game an you go back to base with lost of mone allwais try getin the more expensive objects first. And allways remember to be flexible and adapt to how game moves !

Skillorder

Summoner spells

Spells

Spells2

Runes

I wont try making a Runes build because runes are really expensive and i think there is no reason on it becaus nerly anybody can aford having all the runes. Even this i will recomend you taking some AP runes an some Magic armor and armor